US4103140A - Pneumatic hammer and welder - Google Patents

Pneumatic hammer and welder Download PDF

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Publication number
US4103140A
US4103140A US05/775,675 US77567577A US4103140A US 4103140 A US4103140 A US 4103140A US 77567577 A US77567577 A US 77567577A US 4103140 A US4103140 A US 4103140A
Authority
US
United States
Prior art keywords
spindle
set forth
disposed
housing
chisel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/775,675
Other languages
English (en)
Inventor
Raymond H. Glatthorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US05/775,675 priority Critical patent/US4103140A/en
Priority to CA295,997A priority patent/CA1063949A/fr
Priority to CH197878A priority patent/CH617789A5/fr
Priority to IT20900/78A priority patent/IT1093213B/it
Priority to JP2460478A priority patent/JPS53110937A/ja
Priority to ES467641A priority patent/ES467641A1/es
Priority to FR7806520A priority patent/FR2382975A1/fr
Priority to SE7802592A priority patent/SE423193B/sv
Priority to BE185760A priority patent/BE864681A/fr
Priority to GB9192/78A priority patent/GB1559170A/en
Application granted granted Critical
Publication of US4103140A publication Critical patent/US4103140A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/028—Seam welding; Backing means; Inserts for curved planar seams

Definitions

  • This invention relates to a combination pneumatic hammer and welder and, more particularly, to such a tool which can be remotely operated.
  • Pressurized water nuclear reactors utilize a steam generator to transfer heat from the primary fluid which cools the reactor to a secondary fluid which is vaporized to form steam that drives a steam turbine. While tubes of the steam generator are made of corrosion resistant alloys, they still fail and leak. To prevent primary fluid, which contains contaminants that are radioactive, from mixing with the secondary fluid, tubes that develop leaks are removed from service by plugging. As the number of tubes to be plugged has increased, to reduce the exposure of personnel to radioactive residues that remain in the steam generator after it has been drained, apparatus which fits into the head of the steam generator has been developed. During this development program, it became apparent that tools, which can perform multiple operations would substantially reduce the time required for repair and result in less downtime for the reactor.
  • apparatus for driving a tapered plug into a tube and for forming a seal weld between the tube and the plug when made in accordance with this invention, comprises a spindle having an axially located cavity, a pneumatic hammer disposed in this cavity, and a chisel adapted to receive a tapered plug.
  • the chisel extends through a portion of the spindle and is received by the pneumatic hammer.
  • a welding torch is eccentrically disposed on the spindle and a device for rotating the spindle is also attached thereto so that the apparatus can drive a tapered plug into a tube and form a peripheral seal weld at the outer juncture of the plug and tube in successive operations.
  • FIG. 1 is a plan view of an apparatus for driving a tapered plug in a tube and for forming a seal weld at the juncture between the plug and the tube;
  • FIG. 2 is a partial sectional view taken on line II--II of FIG. 1.
  • FIGS. 1 and 2 there is shown an apparatus 1 for driving a tapered plug 3 into a tube 5 and forming a seal weld at the juncture between the plug 3 and tube 5.
  • the apparatus 1 comprises a spindle 7 having two portions, an upper portion 9 and a lower portion 10. Each portion 9 and 10 has an axially disposed counter bore 11 and 12, respectively, which register to form a centrally located cavity 13 within the spindle 7.
  • the counter bore 12 is threaded to receive the internals of a pneumatic hammer 15 such as Model 2Z487 manufactured by Dayton Electric Manufacturing Company of Chicago, Ill.
  • the pneumatic hammer 15 receives a chisel 17 which extends through the upper portion 9 of the spindle 7.
  • a hardened bushing 19 having a flange 21 on one end is disposed in the opening through which the chisel 17 passes in order to reduce the wear as the chisel is reciprocated by the pneumatic hammer 15 and to prevent damage to the upper portion 9 of the spindle 7 when the chisel 17 strikes the flanged portion 21 as the pneumatic hammer 17 is operated without a load.
  • a fluid supply conduit 23 is disposed in the lower portion 11 of the spindle 7 to provide pneumatic fluid to the pneumatic hammer 15.
  • a spur gear 27 is disposed on the lower portion 10 of the spindle 7 and meshes with a spur gear 28 which is driven by an electric motor and reduction gear drive 29 or other driving means.
  • the gears 27 and 28 are enclosed in a split housing 31 and the upper and lower portions 9 and 10 of the spindle 7 are adapted to be captured by the housing 31 to prevent axial movement therebetween.
  • Bushings 33 and 34 are provided to allow rotation of the spindle 7 within the housing 31.
  • a pair of ball bearings 35 and a thrust bearing 37 are disposed on the bottom portion of the lower portion 10 of the spindle 7 and are mounted on a bracket 39, which clamps to the outer race of the bearings 35 to rotatably support the spindle 7.
  • the thrust bearing 37 abuts the bracket 39 to support the thrust load of the spindle 7.
  • the bracket 39 has a plate 41 extending therefrom. The plate 41 connects the bracket 39 to the gear housing 31 to facilitate rotation of the spindle 7.
  • the chisel 17 has a shoulder 43 adjacent the distal end and the tapered plugs 3 have holes 44 which slide over the end of the chisel 17 and abut the shoulder 43.
  • the plugs 5 also have a frustoconical portion 45 which tapers inwardly from the end with the hole 44.
  • a welding torch 47 is mounted on the spindle 7.
  • the torch 47 has a tungsten or other non-consumable electrode 49 and a duct 51 encircling the electrode 49 for supplying inert gas to the area adjacent the tip of electrode 49 to shield an arc produced during the welding operation. While non-consumable electrodes are preferred, consumable electrodes may be utilized.
  • the tip of the electrode 49 is disposed adjacent the shoulder 43 on the chisel 17 so that the arc will be formed adjacent the periphery of the plug 5 to form a weld between the plug 3 and the tube 5 as the spindle is rotated approximately 360° by the motor 29.
  • the torch 47 is fastened to the upper portion 9 of the spindle 7 by a cover plate 53 which is attached to the spindle 7 by machine screws 54 or other means.
  • a duct 55 is disposed in the lower portion of the spindle 7 and the electric and inert gas supplies for the torch 47 run through the duct 55.
  • the apparatus hereinbefore described automatically performs serial or successive operations of driving a plug 3 into a tube 5 and forming a seal weld at the juncture of the plug and tube and thereby reduces the time requred to plug a tube and it so reduces the exposure of operators to radioactive contaminants within the steam generator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Arc Welding In General (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Percussive Tools And Related Accessories (AREA)
US05/775,675 1977-03-08 1977-03-08 Pneumatic hammer and welder Expired - Lifetime US4103140A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US05/775,675 US4103140A (en) 1977-03-08 1977-03-08 Pneumatic hammer and welder
CA295,997A CA1063949A (fr) 1977-03-08 1978-01-31 Marteau et machine a souder pneumatique
CH197878A CH617789A5 (fr) 1977-03-08 1978-02-23
JP2460478A JPS53110937A (en) 1977-03-08 1978-03-06 Welding device with air system hammer
IT20900/78A IT1093213B (it) 1977-03-08 1978-03-06 Martello e saldatrice pneumatici
ES467641A ES467641A1 (es) 1977-03-08 1978-03-07 Aparato para introducir un obturador
FR7806520A FR2382975A1 (fr) 1977-03-08 1978-03-07 Appareil pneumatique de percussion et de soudage
SE7802592A SE423193B (sv) 1977-03-08 1978-03-07 Pneumatisk hammare och svetsanordning for pluggning och svetsning av ror
BE185760A BE864681A (fr) 1977-03-08 1978-03-08 Appareil pneumatique de percussion et de soudage
GB9192/78A GB1559170A (en) 1977-03-08 1978-03-08 Apparatus for driving and welding a plug into a tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/775,675 US4103140A (en) 1977-03-08 1977-03-08 Pneumatic hammer and welder

Publications (1)

Publication Number Publication Date
US4103140A true US4103140A (en) 1978-07-25

Family

ID=25105143

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/775,675 Expired - Lifetime US4103140A (en) 1977-03-08 1977-03-08 Pneumatic hammer and welder

Country Status (10)

Country Link
US (1) US4103140A (fr)
JP (1) JPS53110937A (fr)
BE (1) BE864681A (fr)
CA (1) CA1063949A (fr)
CH (1) CH617789A5 (fr)
ES (1) ES467641A1 (fr)
FR (1) FR2382975A1 (fr)
GB (1) GB1559170A (fr)
IT (1) IT1093213B (fr)
SE (1) SE423193B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242563A (en) * 1978-06-22 1980-12-30 Westinghouse Electric Corp. Automatic plug welding apparatus
US4262187A (en) * 1978-08-24 1981-04-14 Combustion Engineering, Inc. System for plugging tubes by welding
CN106270925A (zh) * 2016-09-30 2017-01-04 中车南京浦镇车辆有限公司 枕梁焊接气管修复工艺
CN107470747A (zh) * 2017-08-25 2017-12-15 上海电气核电设备有限公司 提高蒸汽发生器堵管效率的焊接工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777110A (en) * 1972-11-29 1973-12-04 Ecodyne Corp Welding gun
US3927295A (en) * 1974-02-01 1975-12-16 Babcock & Wilcox Ltd Welding system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2251599A1 (de) * 1972-10-20 1974-05-02 Siemens Ag Verfahren und verschlusstueck zum abdichten von rohren in waermetauscherrohrboeden mittels schmelzschweissung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3777110A (en) * 1972-11-29 1973-12-04 Ecodyne Corp Welding gun
US3927295A (en) * 1974-02-01 1975-12-16 Babcock & Wilcox Ltd Welding system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4242563A (en) * 1978-06-22 1980-12-30 Westinghouse Electric Corp. Automatic plug welding apparatus
US4262187A (en) * 1978-08-24 1981-04-14 Combustion Engineering, Inc. System for plugging tubes by welding
CN106270925A (zh) * 2016-09-30 2017-01-04 中车南京浦镇车辆有限公司 枕梁焊接气管修复工艺
CN107470747A (zh) * 2017-08-25 2017-12-15 上海电气核电设备有限公司 提高蒸汽发生器堵管效率的焊接工艺

Also Published As

Publication number Publication date
CH617789A5 (fr) 1980-06-13
BE864681A (fr) 1978-09-08
SE423193B (sv) 1982-04-26
FR2382975A1 (fr) 1978-10-06
IT7820900A0 (it) 1978-03-06
IT1093213B (it) 1985-07-19
ES467641A1 (es) 1979-11-16
CA1063949A (fr) 1979-10-09
JPS573463B2 (fr) 1982-01-21
JPS53110937A (en) 1978-09-28
GB1559170A (en) 1980-01-16
FR2382975B1 (fr) 1984-11-16
SE7802592L (sv) 1978-09-09

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